OSPF Support for Multi-VRF on CE Routers

The OSPF Support for Multi-VRF on CE Routers feature provides the capability of suppressing provider edge (PE) checks that are needed to prevent loops when the PE is performing a mutual redistribution of packets between the OSPF and BGP protocols. When VPN routing and forward (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.

OSPF multi-VRF allows you to split the router into multiple virtual routers, where each router contains its own set of interfaces, routing table, and forwarding table.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest caveats and feature information, see
Bug Search Tool and the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the feature information table at the end of this module.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to
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Information About OSPF Support for Multi-VRF on CE Routers

The OSPF Support for Multi-VRF on CE Routers feature provides the capability of suppressing provider edge (PE) checks that are needed to prevent loops when the PE is performing a mutual redistribution of packets between the OSPF and BGP protocols. When VPN routing and forward (VRF) is used on a router that is not a PE (that is, one that is not running BGP), the checks can be turned off to allow for correct population of the VRF routing table with routes to IP prefixes.

OSPF multi-VRF allows you to split the router into multiple virtual routers, where each router contains its own set of interfaces, routing table, and forwarding table. OSPF multi-VRF gives you the ability to segment parts of your network and configure those segments to perform specific functions, yet still maintain correct routing information.

Displays the status of the router. If the display indicates that the router is connected to the VPN backbone, you can use the capabilityvrf-lite command to decouple the PE router from the VPN backbone.

Step 3

configureterminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 4

routerospfprocess-id [vrfvpn-name]

Example:

Router(config)# router ospf 1 vrf grc

Enables OSPF routing and enters router configuration mode.

The process-id argument identifies the OSPF process.

Use the vrf keyword and vpn-name argument to identify a VPN.

Step 5

capabilityvrf-lite

Example:

Router(config)# capability vrf-lite

Applies the multi-VRF capability to the OSPF process.

Verifying the OSPF Multi-VRF Configuration

No specific debug orshow commands are associated with this feature. You can verify the success of the OSPF multi-VRF configuration by using the showipospf[process-id] command to verify that the router is not connected to the VPN backbone.

This output from the showipospfprocesscommand indicates that the PE router is currently connected to the backbone.

RFCs

RFCs

Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

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Technical Assistance

Description

Link

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Feature Information for OSPF
Support for Multi-VRF on CE Routers

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to
www.cisco.com/​go/​cfn. An account on Cisco.com is not required.

Table 1 Feature Information for OSPF
Support for Multi-VRF on CE Routers

Feature
Name

Releases

Feature
Information

OSPF
Support for Multi-VRF on CE Routers

12.0(21)ST

12.0(22)S

12.2(8)B

12.2(13)T

12.2(14)S

The OSPF
Support for Multi-VRF on CE Routers feature provides the capability to suppress
provider edge (PE) checks that are needed to prevent loops when the PE is
performing a mutual redistribution of packets between the OSPF and BGP
protocols. When VPN routing and forwarding (VRF) is used on a router that is
not a PE (that is, one that is not running BGP), the checks can be turned off
to allow for correct population of the VRF routing table with routes to IP
prefixes.

The
following commands are introduced or modified in the feature documented in this
module:

capabilityvrf-lite

Glossary

CERouter--Customer Edge router, an edge router in the C network, defined as a C router which attaches directly to a P router.

CNetwork--Customer (enterprise or service provider) network.

CRouter--Customer router, a router in the C network.

LSA--link-state advertisement
.
Broadcast packet used by link-state protocols that contains information about neighbors and path costs. LSAs are used by the receiving routers to maintain their routing tables.

PERouter--Provider Edge router, an edge router in the P network, defined as a P router which attaches directly to a C router.